7-β- and 10-β-Hydroxylated congeners of CAF-603; elucidation of absolute configuration of CAF-603 family, and their SAR studies in the anti-fungal activity
作者:Ryoko Yasumura、Kumar Dilip Ashtekar、Akio Tonouchi、Tatsuo Nehira、Babak Borhan、Masaru Hashimoto
DOI:10.1016/j.tet.2013.08.065
日期:2013.11
Novel 7-β- and 10-β-hydroxylated congeners of CAF-603 (4 and 5, respectively) were isolated from Trichoderma crassum. Relative configuration of 4 was determined by NOE experiments. Stereochemistry of 7-β-hydroxy group in 5 was established by a combination of vicinal 3JH–H analyses and quantum chemical calculations. Absolute configurations of 4 and 5 were established by observing the Cotton effects
从毛霉中分离到CAF-603的新型7-β-和10-β-羟基化同系物(分别为4和5)。通过NOE实验确定4的相对构型。结合3 J H–H分析和量子化学计算,建立了5中7-β-羟基的立体化学。通过观察其双(2-萘甲酸)酯的棉花效应,可以确定4和5的绝对构型。Ť。景天树还产生已知的CAF-603(1),14-羟基和8,9-β-环氧衍生物(2和3)。目前的研究首先通过考虑其生物合成来建立CAF-603家族的绝对构型。初步的生物学实验表明,分子靶标严格识别环庚烷环的β侧。